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Effects of cosmic rays on hydrocarbon interstellar dust

Published online by Cambridge University Press:  13 February 2013

M. Godard ,
G. Féraud ,
M. Chabot ,
Y. Carpentier ,
T. Pino ,
R. Brunetto ,
J. Duprat ,
C. Engrand ,
P. Bréchignac  and
L. d’Hendecourt
...Show all authors
M. Godard
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France Astrochemistry Laboratory (Code 691), NASA Goddard Space Flight Center, Building 34, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
G. Féraud
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
M. Chabot
Affiliation:
Institut de Physique Nucléaire d’Orsay, Univ. Paris-Sud, Bât. 102, 91405 Orsay, France
Y. Carpentier
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France Laboratoire de Physique des Lasers, Atomes et Molécules, Univ. Lille 1, Bât. P5, 59655 Villeneuve d’Ascq Cedex, France
T. Pino
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
R. Brunetto
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France
J. Duprat
Affiliation:
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Univ. Paris-Sud, Bât. 104, 91405 Orsay, France
C. Engrand
Affiliation:
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Univ. Paris-Sud, Bât. 104, 91405 Orsay, France
P. Bréchignac
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
L. d’Hendecourt
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France
E. Dartois
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France

Abstract

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Hydrogenated amorphous carbons, an important component of the interstellar carbonaceous dust, possess infrared spectral signatures (at 3.4, 6.9 and 7.3 μm) that are ubiquitous in the diffuse interstellar medium of galaxies, but not observed in dense clouds. To better understand the role played by cosmic rays in the disappearance of these absorption bands, irradiation experiments of hydrocarbon dust analogues have been performed with different swift ions. The results obtained through the in situ infrared monitoring of the samples during the irradiations allow to infer the dehydrogenation effect of the cosmic ray distribution on the interstellar hydrogenated amorphous carbons. The importance of this interstellar dust destruction by cosmic rays is discussed in comparison to other energetic processes in different interstellar environments.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 58: ECLA - European Conference on Laboratory Astrophysics , 2012 , pp. 395 - 398
Copyright
© The Author(s) 2013

References

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